Question 1

In a data flow diagram (DFD),a data flow must have a process symbol on at least one end.

Accepted Answer

This is because a data flow represents the transfer of data from one process to another, and every transfer must involve a process. Thus, a data flow must have a process symbol on at least one end.

Question 2

Data stores are shown in a context diagram because data stores are external to the system.

Accepted Answer

Data stores are internal to the system and are not shown in the context diagram. Only external entities and the flow of data between them are depicted in the context diagram.

Question 3

In data flow diagrams (DFD),systems analysts call an entity that supplies data to the system a sink.

Accepted Answer

In data flow diagrams (DFD), systems analysts call an entity that supplies data to the system a source. A sink in a DFD is an entity that receives data from the system.

Question 4

The only disadvantage of the four-model approach is the added time and cost needed to develop a logical and physical model of the current system.

Accepted Answer

The statement accurately reflects the only disadvantage of the four-model approach.

Question 5

The end product of data and process modeling is a logical model that will support business operations and meet user needs.

Accepted Answer

Data and process modeling is done to create a logical model that can support business operations and meet user requirements. The end product of this process is a logical model that serves both purposes. Therefore, the statement is true.

Question 6

In a data flow diagram (DFD),a process symbol can have only one outgoing data flow.

Accepted Answer

A process symbol in a DFD can have multiple outgoing data flows, depending on the number of outputs resulting from the specific process being modeled.

Question 7

In a data flow diagram (DFD),the name of the process appears inside a rectangle.

Accepted Answer

The name of the process in a DFD is represented inside a rectangle.

Question 8

When a data flow diagram (DFD)is exploded,the higher-level diagram is called the child diagram.

Accepted Answer

When a data flow diagram (DFD) is exploded, the higher-level diagram is called the parent diagram, and the more detailed diagram is referred to as the child diagram.

Question 9

In a data flow diagram (DFD),systems analysts call an entity that receives data from the system a source.

Accepted Answer

In a data flow diagram (DFD), an entity that receives data from the system is called a sink, not a source. A source is an entity that provides data to the system.

Question 10

Deciding whether to explode a process further or determine that it is a functional primitive is a matter of experience,judgment,and interaction with programmers who must translate the logical design into code.

Accepted Answer

Deciding whether to explode a process further or determine that it is a functional primitive requires experience, judgment, and interaction with programmers. It is not a straightforward decision and depends on the specific situation. Therefore, the statement is true.

Question 11

When a context diagram is expanded into data flow diagram (DFD)diagram 0,all the connections that flow into and out of process 0 must be retained.

Accepted Answer

This is true as the purpose of expanding a context diagram into a DFD diagram 0 is to show the high-level processes and data flows that occur within the system, while retaining the connections to external entities or processes.

Question 12

A decision tree is read from left to right,with the conditions along the various branches and the actions at the far left.

Accepted Answer

A decision tree is read from top to bottom, with the conditions along the various branches and the actions or outcomes at the leaves (far right or bottom, depending on orientation).

Question 13

A data flow diagram (DFD)does not show the external entities that provide data to the system or receive output from the system.

Accepted Answer

A data flow diagram (DFD) shows the external entities that provide data to the system or receive output from the system, along with the processes, data stores, and data flows within the system.

Question 14

Processes contain the business logic,also called business rules,which transforms the data and produces the required results.

Accepted Answer

Processes indeed contain the business logic that performs specific actions on data to produce desired outcomes or results.

Question 15

When a data flow diagram (DFD)is exploded,the lower-level diagram is referred to as the parent diagram.

Accepted Answer

When a DFD is exploded, the higher-level diagram is referred to as the parent diagram and the lower-level diagram is referred to as the child diagram.

Question 16

In DFDs,a process symbol can be referred to as a white hole,because the inputs,outputs,and general functions of the process are hidden,but the underlying details and logic are known.

Accepted Answer

In DFDs, a process symbol is often referred to as a black box, because the details of its implementation are hidden and only its inputs and outputs are visible.

Question 17

Processes are generally very simple.

Accepted Answer

Processes can be simple or complex, depending on the task they are performing and the requirements for that task.

Question 18

In the systems design phase,a logical model is built that describes how the system will be constructed.

Accepted Answer

The answer of In the systems design phase,a logical model...

Question 19

What makes one system more complex than another is the number of components,the number of levels,and the degree of interaction among its processes,entities,data stores,and data flows.

Accepted Answer

This statement is true. The more components, levels, and interactions a system has, the more complex it is considered to be.

Question 20

The primary purpose of pseudocode is to describe the underlying business logic of code.

Accepted Answer

The primary purpose of pseudocode is to describe the logic of code in a way that is easy to understand and translate into actual code, but it is not specific to business logic. Pseudocode can be used to describe any type of logic in any field of study.

Quiz 5: Data and Process Modeling